Influence of the Co2-W coating prepared by mechanical alloying on the electromagnetism parameter of Fe0.7Ni0.3

Core-shell particles of Co2-W coated Fe0.7Ni0.3 were prepared by mechanical alloying and characterized by TEM, XRD and SEM. The effect of the Co2-W coating on the electromagnetism parameter of Fe0.7Ni0.3 has been investigated. The mechanism of the interaction between the electromagnetism parameter of the core and the shell materials has been discussed. The result shows that the permittivity of Fe0.7Ni0.3 is greatly reduced after the formation of the Co2-W coating, but the permeability is not influenced on the whole. The electromagnetism parameter of the core-shell particles can be adjusted by controlling the electromagnetism parameter of the shell material.